Question

k^2 -100h^2


h2(k + 10)(k – 10)
(k – 10h2)(k + 10)
(k + 10h)(k + 10h)
(k + 10h)(k – 10h)

Answer 1

k^2 -100h^2 = k^2 - (10h)^2


then use the difference square formula